-LRB- CNN -RRB- -- Kelsey Grammer -- actor , producer , Twitter grammarian .

Grammer 's verified Twitter account started on June 30 with the tweet , `` It has come to my attention that the fine people of @Twitter have an egregious grammar problem . I 'm here to help . #KelseyGrammerGrammar . '' Since then , the `` Frasier '' star has been true to his mission , correcting tweets .

When one fan tweeted `` The movie ` Down Periscope ' w / Kelsey Grammer is one of my favorite movies . Its a movie I can watch over & over again . Deal with it '' Grammer responded with `` I 'm honored you think so , but believe it should be * it 's . #KelseyGrammerGrammar . ''

So far , the Twitterverse seems thrilled by the addition of yet another member of the informal Twitter grammar police . One person tweeted , '' @KelseyGrammer , your hashtag #KelseyGrammerGrammar is the best thing ever -LRB- notice my correct use of your , not you 're -RRB- ! ''

Even other celebs are chiming in on the fun .

`` Star Trek '' legend William Shatner tweeted , `` Uh oh ! Dad showed up . No more fun anymore . ;--RRB- @KelseyGrammer @twitter . ''

So watch your p 's and q 's , people . You do n't want to make Sideshow Bob mad .

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Kelsey Grammer 's verified Twitter account launched on June 30

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The actor is singling out tweets encumbered with errant English

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William Shatner tweeted a welcome : `` Uh-oh . Uh oh ! Dad showed up ''